AGRICULTURE
Adaptive interference suppression filter for GNSS receivers
Interference detection on the frontlines: Battling GNSS jamming and spoofing
Is artificial intelligence the key to unlocking the multipath problem in GNSS?
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Interference detection on the frontlines: Battling GNSS jamming and spoofing
GNSS is an invisible thread tying together modern life. Whether it's your smartphone showing directions, an aircraft on final approach, or a power plant syncing time with the grid—GNSS is the backbone.
GNSS signals originate from satellites over 20,000 kilometers away, arriving at earth with weaker power than the ambient radio noise. That makes them vulnerable to interference from both accidental sources—like faulty electronics—and deliberate attacks, such as jamming or spoofing.
Jammertest 2024 presented a series of intense trials designed to push GNSS receivers to their limits. The mission: to understand how these systems cope when faced with deliberate, high-power signal disruption.
Hexagon | NovAtel installed OEM7 receivers with GNSS Resilience and Integrity Technology (GRIT) firmware on vehicles equipped with multiple antennas and data logging systems. Testing included a variety of broadcast interference scenarios:
- High-power jamming: Signal disruptors blasted the receivers with up to 100 watts of interference across multiple frequencies.
- Ramp tests: Jamming power gradually increased, simulating real-world signal congestion.
- Meaconing (spoofing): Delayed copies of real GNSS signals were rebroadcast to fool the receivers.
Jammertest 2024 delivered a clear message: While GNSS remains vulnerable, countermeasures are improving. Technologies like GRIT, RoDAR, and OSNMA are no longer experimental—they’re essential.
What you will learn
Written by Ali Broumandan, resilient GNSS lead and Isabelle Tremblay, geomatics designer at Hexagon’s Autonomous Solutions Business Area, this article details the performance of NovAtel’s GNSS Resilience and Integrity Technology (GRIT), a multi-layered defence strategy embedded in OEM7 receivers, designed to detect, analyse, and mitigate a broad range of interference threats. NovAtel's interference mitigation systems proved that, with the right tools and innovation, GNSS deception can be detected, defeated, and denied.
Overview of NovAtel’s GNSS resilience and integrity (GRIT) solutions and technologies.
Read the full article by downloading Velocity 2025